ARCHIVED REPORTS_XR0004426 - Laserfiche WebLink

Home Browse Search

First Quarter 2006 Groundwater Monitoring Report Boyett Petroleum,419 S.Main,Manteca,CA Page 4 MTBE was not detected at or above the laboratory reported detection limit in the groundwater samples • collected from the other monitoring wells at the site. Concentrations of MTBE in groundwater at the site have decreased significantly during the last three years, as shown on the graph in Figure 5, attached. There has also been a corresponding reduction in the estimated size of the MTBE plume during the same time period. The decrease in concentrations and the reduction in the estimated size of the plume suggest that intrinsic bioremediation has been taking place within the MTBE plume at the site. BTEX and TPH-G have not been detected in any of the site monitoring wells since December 2001. Condor recommends that all groundwater samples be analyzed for gasoline oxygenates/additives only. MTBE has not been detected in the groundwater samples collected from monitoring wells MW-2 and MW-6 for more than two years. The last time MTBE was detected in a water sample collected from monitoring well MW-8 was in March 2004. Since contaminants have not been detected in these three wells for seven or more quarters, Condor recommends that the sampling frequency for MW-2, MW-6, and MW-8 be reduced to once a year. LIMITATIONS This report was prepared under the direct supervision of a Professional Geologist in the State of California. The standard of care for all services performed or furnished by Condor is commensurate with the care and skill ordinarily used by a member of the environmental profession practicing under similar conditions at the same time in the same locality. Condor is not responsible for the accuracy and completeness of information collected and developed by others. This report was prepared for the sole use of Boyett Petroleum, and may not be used or relied upon by any other person(s) without the express written consent and authorization of Boyett Petroleum and Condor. If any changes are made or errors found in the information used for this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes or errors are reviewed by Condor and either appropriately modified or re-approved in writing. Any questions regarding the content of this document should be addressed to Lee Morse at(209) 388-9601. i Respectfully submitted, CONDOR EARTH TECHNOLOGIES, INC. /�✓- `0,1A1 GF �C5 O� Lee H. Morse, P.G. O Associate Geologist 0 e LEE H. MORSE , C1- No. 7&54 OF CA�q�O �a CONDOR